[time-nuts] NTP REFCLOCK for a Jackson Fury??

[Bill Dailey]

Interesting.. I see something completely different with my Fury.

My hard-coded fudge factor is 0.077 yielding:

Every 2.0s: ntpq -p                                     Thu Oct 17 10:20:00
2013

     remote           refid      st t when poll reach   delay   offset
jitter
==============================================================================
-four2.fairy.mat 64.250.177.145   2 u   12   64  377   72.493   17.784
0.524
-66-162-15-65.li 64.236.96.53     2 u   33   64  377   50.226   15.291
1.181
+barricade.rack9 209.51.161.238   2 u   10   64  377   22.908    1.075
0.362
-ccadmin.cycores 130.207.244.240  2 u   38   64  377   39.218    3.972
1.241
 192.168.1.171   .INIT.          16 u    - 1024    0    0.000    0.000
0.000
+SHM(0)          .FURY.           0 l    6   16  377    0.000    0.526
0.034
*SHM(1)          .PPSF.           0 l    5   64  377    0.000    0.008
0.001
-europium.canoni 193.79.237.14    2 u   32   64  377  116.177   -1.573
0.992

So... i could fine tune my fudge some but the point is the jitter is fairly
low.  (fury is from the sentences and ppsf is pps from fury).

My soekris (soekris is the .171) numbers were much better but it is
inoperable for some reason.

Doc


On Thu, Oct 17, 2013 at 9:59 AM, Tim Shoppa <tshoppa at gmail.com> wrote:

> Back in 2003 or so, in the Z3801A with hpgps ntpd refclock driver, I had to
> add a negative offset of -0.98 seconds to the driver's decoding of
> PTIME:TCODE? to get it to be right in combination with PPS refclock.
>
> The documentation in the Z3801A manual correctly described the actual
> behavior.... "PTIME:TCODE? Provides timecode message 980 to 20 ms prior to
> 1 PPS of indicated time".
>
>
>
> On Thu, Oct 17, 2013 at 9:40 AM, Scott Mace <smace at intt.net> wrote:
>
> > I posted a patch for the Fury to work with ntpd in Oct 2008.  It uses the
> > GPGGA output.  The PTIME:TCODE? command is not "on-time" with the 1-PPS
> > output on the Fury, so the HPGPS driver does not work.
> >
> > http://www.febo.com/pipermail/**time-nuts/2008-October/033901.**html<
> http://www.febo.com/pipermail/time-nuts/2008-October/033901.html>
> >
> > the ntp-fury.diff:
> > http://www.febo.com/pipermail/**time-nuts/attachments/**
> > 20081020/846021fe/attachment-**0001.bin<
> http://www.febo.com/pipermail/time-nuts/attachments/20081020/846021fe/attachment-0001.bin
> >
> >
> >
> >         Scott
> >
> >
> >
> > On 10/16/2013 04:44 PM, Frank Hughes wrote:
> >
> >> Hi,
> >>
> >> What NTP REFCLOCK can be used for a Jackson Fury?
> >>
> >> I know that the Jackson Fury docs suggest using:
> >> http://www.realhamradio.com/**gpscon-info.htm<
> http://www.realhamradio.com/gpscon-info.htm>
> >>
> >> But that means I would have to put up a windows server
> >> to replace the FreeBSD ntpd server I built for use w/ the Trimble TB.
> >>
> >> Looking for open source options, if possible.
> >>
> >> Thanks,
> >> Frank
> >> KJ4OLL
> >> ______________________________**_________________
> >> time-nuts mailing list -- time-nuts at febo.com
> >> To unsubscribe, go to https://www.febo.com/cgi-bin/**
> >> mailman/listinfo/time-nuts<
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> >> and follow the instructions there.
> >>
> >>  ______________________________**_________________
> > time-nuts mailing list -- time-nuts at febo.com
> > To unsubscribe, go to https://www.febo.com/cgi-bin/**
> > mailman/listinfo/time-nuts<
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts>
> > and follow the instructions there.
> >
> _______________________________________________
> time-nuts mailing list -- time-nuts at febo.com
> To unsubscribe, go to
> https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts
> and follow the instructions there.
>



-- 
Doc

Bill Dailey
KXØO